5	2
4			5
	1	4
			4	6
		6			4
			1	2

Difficulty: Very easy (0)

		6			4
					1
	4		3
		4		2
1
5			4

Difficulty: Very easy (0)

			2
				4
			6	1	5
4	5	6
	3
		5

Difficulty: Very easy (0)

		4
					6
		6		2	3
6	5		3
1
			4

Difficulty: Very easy (0)